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Comparative Demography of the High-Altitude Lizard, Sceloporus Grammicus (Phrynosomatidae), on the Iztaccihuatl Volcano, Puebla, México

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Comparative Demography of the High-Altitude Lizard, Sceloporus Grammicus (Phrynosomatidae), on the Iztaccihuatl Volcano, Puebla, México Great Basin Naturalist Volume 58 Number 4 Article 7 10-12-1998 Comparative demography of the high-altitude lizard, Sceloporus grammicus (Phrynosomatidae), on the Iztaccihuatl Volcano, Puebla, México Julio A. Lemos-Espinal Proyecto Fauna Silvestre, CENID-COMEF/SARH, Viveros de Coyoacan, Mexico Royce E. Ballinger University of Nebraska–Lincoln, Lincoln Geoffrey R. Smith William Jewell College, Liberty, Missouri Follow this and additional works at: https://scholarsarchive.byu.edu/gbn Recommended Citation Lemos-Espinal, Julio A.; Ballinger, Royce E.; and Smith, Geoffrey R. (1998) "Comparative demography of the high-altitude lizard, Sceloporus grammicus (Phrynosomatidae), on the Iztaccihuatl Volcano, Puebla, México," Great Basin Naturalist: Vol. 58 : No. 4 , Article 7. Available at: https://scholarsarchive.byu.edu/gbn/vol58/iss4/7 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Creat Ba....in Natur.uist 58(4), €:I 1998. pp. 375-379 COMPARATIVE DEMOGRAPHY OF THE HIGH-ALTITUDE LIZARD, SCEWPORUS GRAMMICUS (PHRYNOSOMATIDAE),, ON THE IZTACCIHUATL VOLCANO, PUEBLA, MEXICO Julio A. Lemos-Espinall , Royce E. Ballinger2, and Geoffrey R. Smith3 ABSTRACT.-Population density, reproduction, and survivorship were compared between 2 populations of Sctdoporu5' gra.rll7nicus occurring at different altitudes (3700 m and 4400 m) on the eastern slopes of l:ttaceihuatl Volcano. Puehla, Mbdco. Lizards in both populatloM matured at the same l:lge (14-15 mon) and size (39--42 mm SLY). Population density was slightly greater at high altitude (131-163 per ha) than at low altitude (52-83 per ha). SUlvivorship and no were higher at the low-altitude area, but in general there were no significant demographic variations between altitudes that bave been reported in lizard population at higher latitudes. Studies or lower-elevlltion populations might reveal some differences because previous studies indicate that IiUer size increases at lower altitudes. although they do not differ between our 3700 m and 4400 m populations. Key words: lizard life history, derrwgmphy, reproductUm, altitude variatWn, Sce!oporus grammieus, populaJ.ian den­ "'Y, replacement rate, roroivorship. Life histories and demographic traits of southern Texas, USA, to the state of Oaxaca, lizards can vary along elevational gradients Mexico (Conant and Collins 1991, Flores Vil­ (Ballinger 1979, Grant and Dunham 1990, lela and Gerez 1994). This species has been Smith and Ballinger 1994a, 1994b). Altitudinal poorly studied and little has been published variations in life history characteristics often on its biology, except for studies on its repro­ mimic variation observed across broader geo­ duction (Guillette and Casas-Andreu 1980, graphic ranges that can be attrihuted to differ­ 1981, Ortega and Barb.ult 1984), general pop­ ences in environmental mnditions (e.g., Adolph ulation biology (Lemos-Espinal and Amaya­ and Porter 1993, 1996). In addition, some stud· Elias 1986), growth (Lemos-Espinal and ies have shown that altitudinal variation can Ballinger 1995a), and thermal biology (Lemos­ have at least a partial genetic basis (Smith et Espinal and Ballinger 1995b). aJ. 1994, Ballinger et aJ. 1996), just as studies on geographic variation have shown (Ferguson MATERIALS AND METHODS and Talent 1993, Niewiarowski and Roosen­ burg 1993). Most ofthese studies have focused The 2 populations we studied are located in on lizard populations in north temperate lati­ the Campo Experimental Forestal San Juan tudes. Understanding how life histories and Tetla (19°IO'N, 98°36'W) on the eastern slope demography vary in response to latitude and of Iztaccihuatl Volcano, Puebla, Mexico, at altitude combinations may be useful in identi­ 3700 and 4400 m. On Iztaccihuatl Volcano, S. fying variables responsible for such changes. grammicus can be found up to 4600 m eleva­ In this paper we present data on demo­ tion. At this latitude tree line is 4000 m. The graphic variation of 2 populations of Scelo­ low-elevation site (hereafter designaled !..lIgnna), POf'US gmmmicus Wiegmann, 1828 at different of approximately 4 ha, is located in a Pinus elevations (3700 m and 4400 m) to examine hartwegii forest surrounding a natural lake. whether variations in demography occur at Lizards were seen primarily on logs and subtropical latitudes. Sceloporus gmmmicus is stumps but were occasionally found under a small, viviparous lizard that occurs from tree bark or in cracks in tree trunks. This site If'tC) eel!) Flluru. Sil.,..,.tre" GENID·COMEFISARH, Avcni<1o. PnJI!res&l #S. ~ de Coyooc;In. ),(;1<;0"_ D.R 041 10. ts:cnool oCBiological Sctel'KX;S, Uni¥emtym Nebraslc.-Iinooln, Un(.'\lln, Nfo: 6H58S. ('.orrespoOOenee allthor. 3[)(,~n! ufBiology. William Jewell College, l.iherty, MO 64068. 375 376 GREAT BASIN NATURALIST [Volume 58 Paredon Laguna 6 6 y .. ·5.300 + O.194x 5 y .. ·8,108 .. O.247x A .. 0.8e/ 5 4 Q) Q) N 4 .-N en en 3 3 2 2 ••• 1 O+--'-.--~--~--~ 1+-L-.-~--~--~ 30 40 30 40 50 60 50 60 Snout-Vent Length (mm) Snout-Vent Length (mm) Fig.!. Relationship of litter size to body size in pregnant Sceloporus grammicHs from low- (Laguna) and high- (Pare­ don) altitude populations on the Iztaccihuatl Volcano, Puebla, Mexico. was studied from November 1984 to June recorded for each female, All means are given 1988, and from September 1990 to January + lsx ' unless specified otherwise. 1992, The high-elevation site (hereafter desig­ Using Jolly's (1965) stochastic method, which nated Paredon), ofapproximately 1 ha, is a vol­ is relatively insensitive to differences in chance canic rock formation surrounded by grassland ofcapture or survival among animals (Carothers composed primarily of Festuca tolucensis. 1973), we calculated population density for Lizards at this site live under rocks and in rock each month, Although young and old lizards crevices. "Ve studied this site from November may have differed in capture frequency and 1985 to June 1988, and from September 1990 survivorship, bias in population estimates was to January 1992, From May 1991 to April 1992, probably small (Smith 1981), average minimum temperatures for these 2 Lizards were aged according to size at first sites were very similar (Laguna = 2.0 + a.Goe capture, Since Lemos-Espinal and Ballinger [mean + Is,,], Paredon = 2,2 + 0,6°C); how­ (1995a) found that lizards from both study ever, average maximum temperatures for sites show the same growth rates, we used the Laguna were higher (13,1 + 0,9°C) than for same size categories for both populations: size Paredon (5,7 + 0,5°C; Lemos-Espinal and class 1 (females <39 mm SVL, males <42 mm Ballinger 1995a), SVL; individuals in their 1st yr), size class 2 Both populations were censused monthly, (females 39-45 mm SVL, males 42-49 mm For each captured lizard we measured snout­ SVL; individuals in their 2nd yr), and size class vent length (SVL) to the nearest mm using a 3 (females >45 mm SVL, males >49 mm clear plastic ruler, and body mass (BM) to the SVL; 3 yr or older), For life table analyses we nearest 0,01 g using a Pesola '1'1< spring scale. estimated age by recapture of animals marked We also recorded sex, tail condition (broken, as hatchlings or by using von BertalanflY (1957) regenerated, or unbroken), time of capture, growth analyses (Lemos-Espinal and Ballinger and microhabitat of capture site, Each lizard 1995a), Survivorship was estimated for each was permanently marked by toe clipping, To age class as the proportion of marked animals examine reproduction, we collected females in recaptured the follOWing year, adjacent areas more than 500 m from the 2 study sites (n = 67 for Laguna, n = 54 for RESULTS Paredon) during May 1991 and dissected them to examine reproductive tracts (specimens Litter size increased with female body size currently in JALs personal collection). Size and in both populations (Fig, 1; ,- = 0.85, n = 67, number of yolked follicles or embryos were P < 0,0001 for Laguna, and r = 0,89, n = 54, 1998] DEMOGRAPHY OF SCEWPORUS GRAMMICUS 377 P < 0.0001 for Paredon). Females from Laguna 1e+O had significantly larger litter sizes than did females from Paredon, after controlling for dif­ ferences in body size with ANCaVA (3.64 + 0.10 [n = 54] vs. 3.31 + 0.13 [n = 67]; F 117 = t, _ 85· Laguna 4.92, P < 0.03). The interaction term was not _ 86· Laguna 5e-1 -a- 87· Laguna significant. There was no indication in our - 86· Parudon study, or in that ofGuillette and Casas-Andreu _ 87· Pareclon (1980), that females have more than 1 litter per year. Lizards at both study sites were born at 19-20 mm SVL. Females attained sizes of approximately 39 mm SVL by 14 mon of age 1 2 3 4 5 (Lemos-Espinal and Ballinger 1995a). The Age (years) smallest reproductive female was 39 mm SVL at both Laguna and Paredon, but an SVL of Fig. 2. Survivorship (Ix) curves for Sceloporus grammi­ elM from low- (Laguna) and high- (Paredon) altitude popu­ approximately 40-42 mm was the typical min­ lations on the Iztaccihuatl Volcano, Puebla, Mexico. imum size of reproductive females (Fig 1). These data indicate that females at both study sites mature at an age of 14-15 mon (i.e., in their 2nd fall). low-elevation site, had slightly larger litters Annual survivorship (lxl was calculated for than did individuals from Paredon, the high­ 1985-86 and 1986-87 at Laguna, and for elevation site. This difference may help 1986-87 at Paredon. In general, survivorship explain the difference in Ro between these tended to be greater at Laguna than at Pare­ populations: Laguna's Ro suggests a growing don (Fig.
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